Why wont my Nokie Lumia 635 turn on?

I dropped my phone on Friday evening and after putting my phone back together it worked until the battery died. The next day I have plugged it into the wall charger but the battery icon comes up with a question mark flashing in the middle. I have looked through the forums and tried soft reset and leaving it on charge for a long period of time. It vibrates every 30 seconds on charge and has only today come up with the start up screen then disappears again! Please help!

...because it was dropped, and probably an internal component necessary for the correct charging of the battery was broken or damaged? You could take it to a service center for a more conclusive diagnosis on what could be wrong with your device.